为了提高Inconel 718高温合金螺栓连接孔的疲劳抗力,研究了孔挤压强化对Inconel 718高温合金中心孔试样疲劳寿命的影响,并采用扫描电镜、粗糙度仪、X射线应力测最仪及金相显微镜等仪器对孔壁表面完整性进行分析,探讨了孔挤压强化机制.结果表明:1.90%挤压过盈最的中心孔试样的中值疲劳寿命是未强化试样中值疲劳寿命的1.16~4.79倍.与2.85%挤压过盈量的试样相比,1.90%挤压过盈量试样取得了更优的疲劳寿命增益效果.分析发现:经1.90%挤压过盈量的孔挤压强化后,孔壁表面完整性得到了显著改善,孔壁表面粗糙度下降了 64.2%,孔边形成了较深的残余压应力场,孔边晶粒组织发生了明显的塑性变形,形成了组织强化层.表面完整性的改善对疲劳寿命的增益具有重要作用.
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